A short squeeze occurs when a rising share price forces short sellers to close their positions by buying back stock, adding more demand and pushing the price higher. Days to cover measures how many trading days the entire short interest would need at typical volume to close. A high reading (commonly above 5, very high above 10) signals that shorts cannot exit gracefully if sentiment turns — the structural ingredient for a squeeze. It is necessary but not sufficient: a catalyst, retail or institutional buying, and limited share lending supply usually need to combine with high DTC.

In the United States, FINRA publishes short interest twice a month on a delayed schedule (settlement dates around the 15th and the last business day, released roughly eight business days later). The official feed is on finra.org, and the exchanges (NYSE, Nasdaq) republish for their listed names. Average daily trading volume is available directly from the exchanges, from broker terminals, or from financial portals such as the SEC's EDGAR market data, Yahoo Finance, and Bloomberg. Always check the as-of date — short interest can shift dramatically in two weeks.

Under FINRA Rule 4560, broker-dealers report short positions in customer and proprietary accounts twice each month — for the settlement dates corresponding to the 15th and the last business day. FINRA aggregates the data and releases it about eight business days after the reporting date. There is no real-time short-interest feed for U.S. equities, so a published days-to-cover figure can already be one to three weeks stale by the time you read it. Track changes between reports, not absolute levels alone.

Both measure short-selling pressure but answer different questions. Short interest / float tells you what share of the freely tradable supply has been sold short — a balance-sheet view of crowding. Days to cover divides short interest by average daily volume, giving a flow-based estimate of how long unwinding would take. A small-cap with 30% short interest but heavy daily turnover can have a low DTC, while a sleepy stock with 10% short interest and thin volume can post a much higher DTC. Squeeze setups tend to score high on both.

There is no SEC-defined threshold, but practitioner rules of thumb cluster around: under 1 day is light, 1 to 5 days is typical for actively traded large-caps, 5 to 10 days is elevated and worth watching, and above 10 days is high enough that any unwind would move the market. Readings above 20 are rare and historically associated with squeeze episodes such as Volkswagen 2008 and GameStop 2021. Always compare against the stock's own history and its sector peers rather than a fixed cutoff.

The inputs come from regulated sources — FINRA-supervised broker reports and exchange-published trading volume — so deliberate falsification is rare and carries enforcement risk. However, the metric has structural blind spots. Synthetic short exposure via swaps or options is not captured in FINRA short-interest filings, fails-to-deliver can distort recorded share counts, and average daily volume spikes after a stock goes viral, mechanically lowering DTC even as crowding worsens. Read the figure as one data point in a wider analysis, not as ground truth.